[ 
http://issues.apache.org/jira/browse/WICKET-142?page=comments#action_12457038 ] 
            
Orion Letizi commented on WICKET-142:
-------------------------------------

Here's a nice sample config that I cooked up when I was testing Wicket against 
Terracotta:

http://www.terracotta.org/confluence/display/wiki/Wicket

> NullPointerException after deserialize 
> wicket.util.concurrent.CopyOnWriteArrayList
> ----------------------------------------------------------------------------------
>
>                 Key: WICKET-142
>                 URL: http://issues.apache.org/jira/browse/WICKET-142
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 1.2.3
>            Reporter: Ingram Chen
>         Assigned To: Igor Vaynberg
>
> wicket.feedback.FeedbackMessages by default using 
> wicket.util.concurrent.CopyOnWriteArrayList for storage. however 
> CopyOnWriteArrayList internally use a transient Object[] array_ without 
> checking null and lazy initialization. This may cause NullPointerException 
> after session replication or the like. Below is stack trace while testing 
> terracotta session clustering :
> WicketMessage: unable to get object, model: 
> Model:classname=[wicket.feedback.FeedbackMessagesModel]:attached=true, called 
> with component [MarkupContainer [Component id = messages, page = 
> ngc.wicket.pages.MainPage , path = 
> 7:globalFeedback:feedbackul:messages.FeedbackPanel$MessageListView, isVisible 
> = true, isVersioned = false]]
> Root cause:
> java.lang.NullPointerException
> at wicket.util.concurrent.CopyOnWriteArrayList.size 
> (CopyOnWriteArrayList.java:152)
> at wicket.feedback.FeedbackMessages.messages(FeedbackMessages.java:258)
> at 
> wicket.feedback.FeedbackMessagesModel.onGetObject(FeedbackMessagesModel.java:101)
> at wicket.model.AbstractDetachableModel.getObject 
> (AbstractDetachableModel.java:104)
> at wicket.Component.getModelObject(Component.java:990)
> at 
> wicket.markup.html.panel.FeedbackPanel.updateFeedback(FeedbackPanel.java:234)
> at wicket.Page$2.component (Page.java:372)
> at wicket.MarkupContainer.visitChildren(MarkupContainer.java:744)
> at wicket.Page.renderPage(Page.java:368)
>   

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